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create containers on nodes with least current containers #301

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Merged
runleveldev merged 1 commit into from
May 11, 2026
Merged

create containers on nodes with least current containers #301

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21 changes: 20 additions & 1 deletion create-a-container/routers/containers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -351,7 +351,26 @@ router.post('/', async (req, res) => {
nodeWhere.nvidiaAvailable = true;
}

const node = await Node.findOne({ where: nodeWhere });
// Select the node with the fewest existing containers to balance load.
// LEFT JOINs containers, groups by node, and orders by count ascending
// so the least-loaded node is chosen first.
const node = await Node.findOne({
where: nodeWhere,
include: [{
model: Container,
as: 'containers',
attributes: [],
required: false
}],
attributes: {
include: [
[Sequelize.fn('COUNT', Sequelize.col('containers.id')), 'containerCount']
]
},
group: ['Node.id'],
order: [[Sequelize.fn('COUNT', Sequelize.col('containers.id')), 'ASC']],
subQuery: false
});
if (!node && wantsNvidia) {
throw new Error('NVIDIA requested but no NVIDIA-capable nodes are available in this site');
}
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